Add support for migrating from Gitlab (#9084)

* First stab at a Gitlab migrations interface.

* Modify JS to show migration for Gitlab

* Properly strip out #gitlab tag from repo name

* Working Gitlab migrations!
Still need to figure out how to hide tokens/etc from showing up in opts.CloneAddr

* Try #2 at trying to hide credentials.
CloneAddr was being used as OriginalURL.
Now passing OriginalURL through from the form and saving it.

* Add go-gitlab dependency

* Vendor go-gitlab

* Use gitlab.BasicAuthClient
Correct CloneURL.
This should be functioning!
Previous commits fixed "Migrated from"
from including the migration credentials.

* Replaced repoPath with repoID globally.
RepoID is grabbed in NewGitlabDownloader

* Logging touchup

* Properly set private repo status.
Properly set milestone deadline time.
Consistently use Gitlab username for 'Name'.

* Add go-gitlab vendor cache

* Fix PR migrations:
- Count of issues is kept to set a non-conflicting PR.ID
- Bool is used to tell whether to fetch Issue or PR comments

* Ensure merged PRs are closed and set with the proper time

* Remove copyright and some commented code

* Rip out '#gitlab' based self-hosted Gitlab support

* Hide given credentials for migrated repos.

CloneAddr was being saved as OriginalURL.

Now passing OriginalURL through from the form and
saving it in it's place

* Use asset.URL directly, no point in parsing.
Opened PRs should fall through to false.

* Fix importing Milestones.
Allow importing using Personal Tokens or anonymous access.

* Fix Gitlab Milestone migration if DueDate isn't set

* Empty Milestone due dates properly return nil, not zero time

* Add GITLAB_READ_TOKEN to drone unit-test step

* Add working gitlab_test.go.
A Personal Access Token, given in env variable GITLAB_READ_TOKEN
is required to run the test.

* Fix linting issues

* Add modified JS files

* Remove pre-build JS files

* Only merged PRs are marged as merged/closed

* Test topics

* Skip test if gitlab is inaccessible

* Grab personal token from username, not password.
Matches Github migration implementation

* Add SetContext() to GitlabDownloader.

* Checking Updated field in Issues.

* Actually fetch Issue Updated time from Gitlab

* Add Gitlab migration GetReviews() stub

* Fix Patch and Clone URLs

* check Updated too

* fix mod

* make vendor with go1.14

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

vendor/github.com/xanzy/go-gitlab/strings.go

@@ -0,0 +1,94 @@
+//
+// Copyright 2017, Sander van Harmelen
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package gitlab
+
+import (
+	"bytes"
+	"fmt"
+
+	"reflect"
+)
+
+// Stringify attempts to create a reasonable string representation of types in
+// the GitHub library.  It does things like resolve pointers to their values
+// and omits struct fields with nil values.
+func Stringify(message interface{}) string {
+	var buf bytes.Buffer
+	v := reflect.ValueOf(message)
+	stringifyValue(&buf, v)
+	return buf.String()
+}
+
+// stringifyValue was heavily inspired by the goprotobuf library.
+func stringifyValue(buf *bytes.Buffer, val reflect.Value) {
+	if val.Kind() == reflect.Ptr && val.IsNil() {
+		buf.WriteString("<nil>")
+		return
+	}
+
+	v := reflect.Indirect(val)
+
+	switch v.Kind() {
+	case reflect.String:
+		fmt.Fprintf(buf, `"%s"`, v)
+	case reflect.Slice:
+		buf.WriteByte('[')
+		for i := 0; i < v.Len(); i++ {
+			if i > 0 {
+				buf.WriteByte(' ')
+			}
+
+			stringifyValue(buf, v.Index(i))
+		}
+
+		buf.WriteByte(']')
+		return
+	case reflect.Struct:
+		if v.Type().Name() != "" {
+			buf.WriteString(v.Type().String())
+		}
+
+		buf.WriteByte('{')
+
+		var sep bool
+		for i := 0; i < v.NumField(); i++ {
+			fv := v.Field(i)
+			if fv.Kind() == reflect.Ptr && fv.IsNil() {
+				continue
+			}
+			if fv.Kind() == reflect.Slice && fv.IsNil() {
+				continue
+			}
+
+			if sep {
+				buf.WriteString(", ")
+			} else {
+				sep = true
+			}
+
+			buf.WriteString(v.Type().Field(i).Name)
+			buf.WriteByte(':')
+			stringifyValue(buf, fv)
+		}
+
+		buf.WriteByte('}')
+	default:
+		if v.CanInterface() {
+			fmt.Fprint(buf, v.Interface())
+		}
+	}
+}